It's a lovely color, and quite waterproof. However, I have noticed it feels slightly dry, so I only use it in pens that have a generous flow.
Verified purchase: Yes | Condition: New
The ink is delivered swiftly and in good shape.
Verified purchase: Yes | Condition: New
This ink is a saturated version of Pilot Iroshizku's Shin Kai. It behaves well too. I have both Sei Boku and Souboku and they are different shades of blue so there is not crossover by owning both.
Verified purchase: Yes | Condition: New
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